LED backlight and liquid crystal display device

a liquid crystal display and backlight technology, applied in the direction of illuminated signs, display means, instruments, etc., can solve the problems of deterioration in the led backlight to have a very large thickness, and in-plane uniformity of brightness of led backlight, so as to prevent the increase of the thickness of led backlight, prevent the lowering of reliability and workability, and the effect of sufficient heigh

Active Publication Date: 2012-06-14
SHARP KK
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This arrangement enhances in-plane uniformity, reduces the thickness and frame width of the LED backlight, and facilitates easier wiring, improving manufacturing efficiency and cost-effectiveness.

Problems solved by technology

However, the inventor of the present invention discovered that, unfortunately, both of the arrangements disclosed in the above prior art patent application publications cause deterioration in in-plane uniformity of brightness of the LED backlight.
This causes deterioration in in-plane uniformity of brightness of the LED backlight.
Further, unfortunately, the arrangement disclosed in Japanese Patent Application Publication, Tokukai, No. 2005-353498 A causes the LED backlight to have a very large thickness.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • LED backlight and liquid crystal display device
  • LED backlight and liquid crystal display device
  • LED backlight and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

Preferred Embodiment 1

[0070]One preferred embodiment of the present invention is described below with reference to FIG. 1. FIG. 1 illustrates an arrangement of an LED backlight 10 of the present preferred embodiment. In FIG. 1, the LED backlight 10 is viewed from that surface (rear surface) of a chassis panel 20 on which an LED (not shown) is not provided.

Components

[0071]As shown in FIG. 1, the LED backlight 10 of the present preferred embodiment preferably includes: an LED (light-emitting diode; not shown) serving as a light source; an LED substrate 40 on which the LED is mounted; an LED driver substrate 50 arranged to generate a power supply and a signal for driving the LED, the chassis panel 20 on which the LED substrate 40, the LED driver substrate 50 are fixed, and a wire 60 arranged to connect the LED substrate 40 to the LED driver substrate 50.

Structure

[0072]The LED backlight 10 of the present preferred embodiment is arranged such that the LED substrate 40 and the LED driver ...

embodiment 2

Preferred Embodiment 2

[0090]Another preferred embodiment of the present invention is described below with reference to FIGS. 2 and 3. Note that the present preferred embodiment is identical to Preferred Embodiment except for arrangements described below. Further, for convenience of explanation, components having the same functions as those shown in the drawing of Preferred Embodiment 1 are given the same reference numerals, and therefore are not explained repeatedly.

[0091]An LED backlight 10 of the present preferred embodiment is different from the LED backlight 10 of Preferred Embodiment 1 in that connection holes 25 are provided in positions where an LED driver substrate 50 overlaps LED substrates 40. That is, the connection holes 25 are provided in positions corresponding to rear surfaces of the LED substrates 40 and in a position corresponding to a rear surface of the LED driver substrate 50.

[0092]As in Preferred Embodiment 1, the LED driver substrate 50 can be connected to each...

embodiment 3

Preferred Embodiment 3

[0103]Another preferred embodiment of the present invention is described below with reference to FIG. 4. FIG. 4 illustrates an arrangement of an LED backlight 10 of the present preferred embodiment.

[0104]Note that the present preferred embodiment is identical to Preferred Embodiment 1 except for arrangements described below. Further, for convenience of explanation, components having the same functions as those shown in the drawing of Preferred Embodiment 1 are given the same identical reference numerals, and therefore are not explained repeatedly.

[0105]Unlike the LED backlight 10 of Preferred Embodiment 1, the LED backlight 10 of the present preferred embodiment includes three LED substrates 40 (first LED substrate 40a, second LED substrate 40b, third LED substrate 40c). That is, the LED backlight 10 of the present preferred embodiment is arranged such that an additional LED substrate 40 is provided next to the second LED substrate 40b in an x direction in the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
widthaaaaaaaaaa
lengthaaaaaaaaaa
uniformityaaaaaaaaaa
Login to View More

Abstract

An LED backlight in which deterioration in in-plane uniformity of brightness is prevented, whose thickness, frame width, and wire length are reduced, and in which wiring can be carried out easily, includes an LED provided on one surface of an LED substrate; the LED substrate is mounted on a chassis panel so that a surface of the LED substrate opposite to the one surface contacts the chassis panel; and the chassis panel has a connection hole provided in a portion of a region of the chassis panel in which region the LED substrate is mounted, which passes through the chassis panel.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an LED backlight including LEDs (light-emitting diodes) and a liquid crystal display device using the LED backlight.[0003]2. Description of the Related Art[0004]Conventionally, a backlight has been widely used to illuminate a display panel which is not self-luminous. For example, since a liquid crystal panel used in a liquid crystal display device is not self-luminous, a backlight is used to illuminate a back surface of the liquid crystal panel. The term “backlight” used herein refers to a device which has a function of illuminating a display panel with the use of a light source.[0005]In recent years, an LED backlight including LEDs (light-emitting diodes) has been used as a light source of a backlight.[0006]Generally, the LED backlight mainly includes (i) LEDs, (ii) an LED substrate on which the LEDs are mounted, (iii) an LED driver substrate which generates a power supply and a signal ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(United States)
IPC IPC(8): G02F1/13357G09F13/04
CPCG02F1/133603G02F2001/133612G02F1/133611G02F1/133608G02F1/133612
InventorTOMIYOSHI, AKIRA
OwnerSHARP KK